gunro -gur-gu'o- gismu

x1 rolls/trundles on/against surface x2 rotating on axis/axle x3; x1 is a roller.

See also bolci, carna, jendu, slanu.

In notes:

bolci
x1 is a ball/sphere/orb/globe [shape/form] of material x2; x1 is a spherical object [made of x2].
carna
x1 turns about vector x2 towards direction x3, turning angular distance / to face point x4
jendu
x1 is an axle/spindle [tool] on which x2 rotates, of material/properties x3.
slanu
x1 is a cylinder [shape/form] of material x2.
gurgau
x1=ga1 rolls object x2=gu1 on/against surface x3=gu2, with axis/ axle of rotation x4=gu3.
gurmu'u
x1 rolls (moves via rolling) to destination x2 from origin x3 over path x4
tolgurgau
x1=ga1 unrolls/unravels object x2=gu1 on/against surface x3=gu2, with axis/ axle of rotation x4=gu3.